Author(s):
1. Zoran Popović, University of Belgrade, Faculty of Physics, Serbia
2. Milan Damnjanović, SANU, NanoLab, Fizički fakultet, Univerzitet u Beogradu , 3. Ivanka Milošević, Faculty of Physics, University of Belgrade, Serbia

Abstract:
Homogeneous elastic deformations of single-walled carbon nanotubes (SWCNTs)—including torsion, axial, and circumferential strain—are experimentally accessible and preserve the symmetry of chiral nanotubes. Such deformations continuously modify atomic positions, causing the electronic band structure to evolve. Even slight perturbations can induce a transition from quasi-metallic to semiconducting behaviour. Hamiltonian reparameterization under homogeneous deformation produces gap closing and reopening in the non-local inverse space, altering the SWCNT’s topological parameters. The sequence of gap closures in adiabatic processes is governed by the order of the principal axis and the corresponding band dispersions. Singular points, where bands with with m ̃=0 or n/2 (for even n) re-open, can close the gap at the Γ or Π points of the Brillouin zone. Within the deformation space, specific pathways are energetically favored for reaching and crossing these singular points changing topological phase of system.

Key words:
carbon nanotube,symmetry,topological phase transition,deformations

Thematic field:
SYMPOSIUM A - Science of matter, condensed matter and physics of solid states

Date of abstract submission:
11.08.2025.

Conference:
Contemporary Materials 2025 - Savremeni Materijali

Applied paper from author